CN215934544U

CN215934544U - Stator punching sheet, stator with same, motor and air-conditioning fan

Info

Publication number: CN215934544U
Application number: CN202121630532.5U
Authority: CN
Inventors: 葛梦; 李文瑞
Original assignee: Midea Welling Motor Technology Shanghai Co Ltd
Current assignee: Midea Welling Motor Technology Shanghai Co Ltd
Priority date: 2021-07-16
Filing date: 2021-07-16
Publication date: 2022-03-01
Anticipated expiration: 2031-07-16

Abstract

The utility model discloses a stator punching sheet, a stator with the stator punching sheet, a motor and an air-conditioning fan, wherein the stator punching sheet comprises a stator yoke part and a plurality of stator tooth parts, outer side teeth of the stator tooth parts comprise outer tooth bodies connected with the outer sides of the stator yoke part, and first and second tooth shoes which are arranged along the circumferential direction of the stator yoke part and are connected with the free ends of the outer tooth bodies; the inner side teeth of the stator tooth part comprise inner tooth bodies connected with the inner side of the stator yoke part, third tooth shoes and fourth tooth shoes which are arranged along the circumferential direction of the stator yoke part and are connected with the free ends of the inner tooth bodies, the first tooth shoes and the third tooth shoes are arranged correspondingly, and the second tooth shoes and the fourth tooth shoes are arranged correspondingly; in the radial direction of the stator yoke, the thickness of the first tooth shoe is smaller than that of the second tooth shoe and the thickness of the third tooth shoe is larger than that of the fourth tooth shoe, or the thickness of the first tooth shoe is larger than that of the second tooth shoe and the thickness of the third tooth shoe is smaller than that of the fourth tooth shoe. The motor with the stator punching sheet can reduce vibration and noise of the motor.

Description

Stator punching sheet, stator with same, motor and air-conditioning fan

Technical Field

The utility model relates to the technical field of motors, in particular to a stator punching sheet, a stator with the stator punching sheet, a motor and an air conditioner fan.

Background

The permanent magnet brushless direct current motor and the like applied to the air conditioner fan mostly adopt a surface-mounted rotor structure, the performance is good, the structure is simple, but in the surface-mounted rotor structure, an electromagnetic air gap is large, the air gap flux density is relatively low, and the output capacity is difficult to further improve. In the related art, the motor adopts a built-in rotor structure to improve the air gap magnetic field intensity, so that the output power of the motor is improved. However, this structure has a problem that the cogging torque and the torque ripple are large, and vibration and noise are large.

SUMMERY OF THE UTILITY MODEL

The utility model mainly aims to provide a stator punching sheet, aiming at reducing vibration and noise of a motor during working.

In order to achieve the above object, the present invention provides a stator punching sheet, including:

a stator yoke; and

a plurality of stator teeth provided at intervals in a circumferential direction of the stator yoke;

the stator teeth portion comprises outer teeth and inner teeth;

the outer side teeth comprise outer tooth bodies, first tooth shoes and second tooth shoes, the outer tooth bodies are connected with the outer sides of the stator yoke portions, the first tooth shoes and the second tooth shoes are arranged along the circumferential direction of the stator yoke portions, and the first tooth shoes and the second tooth shoes are connected with free ends of the outer tooth bodies;

the inner side teeth comprise inner tooth bodies, third tooth shoes and fourth tooth shoes, the inner tooth bodies are connected with the inner sides of the stator yoke portions, the third tooth shoes and the fourth tooth shoes are arranged along the circumferential direction of the stator yoke portions, the third tooth shoes and the fourth tooth shoes are connected with free ends of the inner tooth bodies, the first tooth shoes and the third tooth shoes are arranged correspondingly, and the second tooth shoes and the fourth tooth shoes are arranged correspondingly;

in a radial direction of the stator yoke, a thickness of the first tooth shoe is smaller than a thickness of the second tooth shoe and a thickness of the third tooth shoe is larger than a thickness of the fourth tooth shoe, or a thickness of the first tooth shoe is larger than a thickness of the second tooth shoe and a thickness of the third tooth shoe is smaller than a thickness of the fourth tooth shoe.

In one embodiment, each of the first tooth shoes is located between two adjacent second tooth shoes.

In one embodiment, the first tooth shoe of one stator tooth portion has a first gap with the second tooth shoe of another adjacent stator tooth portion, and the third tooth shoe of one stator tooth portion has a second gap with the fourth tooth shoe of another stator tooth portion;

in the circumferential direction of the stator punching sheet, the widths of the first gaps are the same, and the widths of the second gaps are the same.

In one embodiment, the outer tooth body and the inner tooth body form a tooth body of the stator tooth part, and the tooth body has a center line passing through a center point of the stator yoke part on an end surface of the stator punching sheet in the thickness direction;

the free ends of the first tooth shoe, the second tooth shoe, the third tooth shoe and the fourth tooth shoe and the center line respectively correspond to a first central angle, a second central angle, a third central angle and a fourth central angle, the first central angle is equal to the second central angle, the third central angle is equal to the fourth central angle, and the first central angle is smaller than the third central angle.

In one embodiment, the stator punching sheet is arranged on the end surface of the stator punching sheet in the thickness direction;

an outer peripheral edge of the first tooth shoe and an outer peripheral edge of the second tooth shoe are symmetrical with respect to the outer gear body, and an inner peripheral edge of the first tooth shoe and an inner peripheral edge of the second tooth shoe are asymmetrical with respect to the outer gear body; and/or

An outer peripheral edge of the third tooth shoe and an outer peripheral edge of the fourth tooth shoe are asymmetrical with respect to the inner tooth flank, and an inner peripheral edge of the third tooth shoe and an inner peripheral edge of the fourth tooth shoe are symmetrical with respect to the inner tooth flank.

The utility model also provides a stator which comprises a stator core, wherein the stator core comprises a plurality of laminated stator punching sheets;

stator yoke parts of a plurality of stator punching sheets are stacked to form an annular yoke part;

a plurality of stator tooth portions of a plurality of stator punching sheet are one-to-one stacked to form a plurality of double tooth portions, double tooth portion includes outer tooth section and internal tooth section, the outer tooth section includes the outer tooth body that a plurality of stacked set up, the internal tooth section includes the interior tooth body that a plurality of stacked set up.

The utility model also proposes an electric machine comprising:

an outer rotor;

an inner rotor coaxially disposed with the outer rotor and rotatable at the same speed in the same direction; and

the stator is arranged between the outer rotor and the inner rotor.

In one embodiment, the outer rotor includes a plurality of first permanent magnets arranged at intervals in a circumferential direction;

the inner rotor comprises a plurality of second permanent magnets arranged at intervals along the circumferential direction;

the plurality of first permanent magnets and the plurality of second permanent magnets are arranged in a one-to-one manner.

In one embodiment, the first permanent magnet and the second permanent magnet opposite thereto have opposite polarities, and the outer tooth section and the inner tooth section are respectively wound with coils.

In one embodiment, the first permanent magnet and the second permanent magnet opposite thereto have the same polarity, and the annular yoke is wound with a coil.

The utility model also provides an air conditioner fan which is characterized by comprising the motor.

A plurality of above-mentioned stator punching sheets are range upon range of the setting in the thickness direction of stator punching sheet, can form the stator core of the stator of birotor motor.

Because above-mentioned stator punching has a plurality of stator tooth portions that set up along the circumference interval of stator yoke portion, and every stator tooth portion has outside tooth and inboard tooth simultaneously to above-mentioned stator punching can be used for making the stator of birotor motor. When the outer rotor and the inner rotor of the double-rotor motor are coaxially arranged and rotate in the same direction at the same speed, the output torque of the double-rotor motor is equal to the sum of the output torques of the outer rotor and the inner rotor. Compared with a conventional single-rotor motor (namely, an inner rotor motor or an outer rotor motor), the motor has higher output torque, so that higher output power can be realized.

In the stator punching sheet, in the circumferential direction of the stator yoke portion, the thickness of the first tooth shoe is smaller than that of the second tooth shoe, and the thickness of the third tooth shoe is larger than that of the fourth tooth shoe, or the thickness of the first tooth shoe is larger than that of the second tooth shoe, and the thickness of the third tooth shoe is smaller than that of the fourth tooth shoe, that is, the radial thicknesses of the first tooth shoe and the second tooth shoe on the left side and the right side of the outer tooth are different (offset occurs in the radial direction), the radial thicknesses of the third tooth shoe and the fourth tooth shoe on the left side and the right side of the inner tooth are different (offset occurs in the radial direction), and the first tooth shoe and the second tooth shoe on the left side and the right side of the outer tooth and the third tooth shoe and the fourth tooth shoe on the left side and the right side of the inner tooth are offset in opposite directions along the circumferential direction. Therefore, the phase of the cogging torque of the outer motor of the double-rotor motor is shifted to a certain extent, the phase of the cogging torque of the inner motor of the double-rotor motor is also shifted to a certain extent, and the phase shift direction of the cogging torque of the outer motor of the double-rotor motor is opposite to the phase shift direction of the cogging torque of the inner motor of the double-rotor motor. And then after the cogging torques of the inner motor and the outer motor are synthesized (superposed), the maximum value of the synthesized (superposed) cogging torque is smaller than the sum of the maximum values of the cogging torques of the outer motor and the inner motor, so that the total cogging torque of the double-rotor motor can be reduced, the torque ripple is reduced, and the reduction of the vibration and the noise of the double-rotor motor is facilitated.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a stator punching sheet according to an embodiment of the present invention;

fig. 2 is a partial enlarged view of the stator lamination shown in fig. 1 (illustrating the radial thickness of the tooth shoe);

fig. 3 is a partial enlarged view of the stator lamination shown in fig. 1 (illustrating the circumferential length of the tooth shoe);

fig. 4 is a partial enlarged view of the stator lamination shown in fig. 1 (illustrating a central angle of the tooth shoe);

FIG. 5 is a schematic structural diagram of a stator according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a motor according to an embodiment of the present invention;

FIG. 7 illustrates a cogging torque waveform of a prior art inside motor, outside motor, and a resultant (superimposed) combination of the two;

fig. 8 shows cogging torque waveforms of the inner motor, the outer motor, and the combination (superposition) of the two in accordance with the present invention.

The reference numbers illustrate:

the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture, and if the specific posture is changed, the directional indications are changed accordingly.

In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, if appearing throughout the text, "and/or" is meant to include three juxtaposed aspects, taking "A and/or B" as an example, including either the A aspect, or the B aspect, or both A and B satisfied aspects. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

The utility model provides a stator punching sheet.

In the embodiment of the present invention, as shown in fig. 1 and 2, the stator lamination 200 includes a stator yoke portion 210 and a stator tooth portion 220. Stator yoke 210 is annular. The stator teeth 220 are plural, and the plural stator teeth 220 are provided at intervals in the circumferential direction of the stator yoke 210. That is, a plurality of stator teeth 220 are all provided on stator yoke 210, and a plurality of stator teeth 220 are arranged at intervals and encircle stator yoke 210.

The stator teeth 220 include outer teeth 220a and inner teeth 220 b. The outer teeth 220a are positioned outside the stator yoke 210 and coupled to the outside of the stator yoke 210. The inner teeth 220b are positioned inside the stator yoke 210 and coupled to the inside of the stator yoke 210.

The outer teeth 220a include an outer tooth body 221, a first tooth shoe 222, and a second tooth shoe 223. The outer tooth body 221 is connected to the outside of the stator yoke 210. Outer tooth bodies 221 extend outward of stator yoke 210 in the radial direction of stator yoke 210. The first tooth shoe 222 and the second tooth shoe 223 are arranged along the circumferential direction of the stator yoke portion 210, and are both connected to the free end of the outer tooth shell 221. The free end of the outer tooth body 221 is the end of the outer tooth body 221 away from the stator yoke 210. The first tooth shoe 222 and the second tooth shoe 223 are arranged along the circumferential direction of the stator yoke portion 210 and are connected to the free end of the outer tooth body 221, that is, the first tooth shoe 222 and the second tooth shoe 223 extend towards two sides of the outer tooth body 221 along the circumferential direction of the stator yoke portion 210, and the extending direction of the first tooth shoe 222 is opposite to that of the second tooth shoe 223, so that the first tooth shoe 222 and the second tooth shoe 223 are located at two sides of the outer tooth body 221.

The inboard tooth 220b includes an inner tooth body 224, a third tooth shoe 225 and a fourth tooth shoe 226. Inner yoke 224 is connected to the inside of stator yoke 210. Inner yoke 224 extends radially inward of stator yoke 210 toward stator yoke 210. Third and

fourth tooth shoes

225 and 226 are arranged in the circumferential direction of the stator yoke 210 and are each connected to the free end of the inner tooth flank 224. The free end of the inner gear body 224 is the end of the inner gear body 224 away from the stator yoke 210. The third tooth shoe 225 and the fourth tooth shoe 226 are arranged along the circumferential direction of the stator yoke portion 210 and are connected to the free end of the inner tooth body 224, that is, the third tooth shoe 225 and the fourth tooth shoe 226 extend toward two sides of the inner tooth body 224 along the circumferential direction of the stator yoke portion 210, and the third tooth shoe 225 extends in the opposite direction to the fourth tooth shoe 226, so that the third tooth shoe 225 and the fourth tooth shoe 226 are located on two sides of the inner tooth body 224.

In the radial direction of the stator yoke 210, the first tooth shoe 222 is provided corresponding to the third tooth shoe 225, and the second tooth shoe 223 is provided corresponding to the fourth tooth shoe 226.

As shown in fig. 1 and 2, in the radial direction of the stator yoke 210, the thickness D1 of the first tooth shoe 222 is smaller than the thickness D2 of the second tooth shoe 223, and the thickness D3 of the third tooth shoe 225 is larger than the thickness D4 of the fourth tooth shoe 226, or the thickness D1 of the first tooth shoe 222 is larger than the thickness D2 of the second tooth shoe 223, and the thickness D3 of the third tooth shoe 225 is smaller than the thickness D4 of the fourth tooth shoe 226. That is, D1 < D2 and D3 > D4, or D1 > D2 and D3 < D4.

In the present embodiment, the thickness D1 of the first tooth shoe 222 is the thickness of the free end of the first tooth shoe 222 in the radial direction of the stator yoke 210, the thickness D2 of the second tooth shoe 223 is the thickness of the free end of the second tooth shoe 223 in the radial direction of the stator yoke 210, the thickness D3 of the third tooth shoe 225 is the thickness of the free end of the third tooth shoe 225 in the radial direction of the stator yoke 210, and the thickness D4 of the fourth tooth shoe 226 is the thickness of the free end of the fourth tooth shoe 226 in the radial direction of the stator yoke 210.

In other embodiments, the thickness D1 of the first tooth shoe 222 may also be the thickness of the connection end of the first tooth shoe 222 close to the outer tooth body 221 in the radial direction of the stator yoke 210, the thickness D2 of the second tooth shoe 223 may also be the thickness of the connection end of the second tooth shoe 223 close to the outer tooth body 221 in the radial direction of the stator yoke 210, the thickness D3 of the third tooth shoe 225 may also be the thickness of the connection end of the third tooth shoe 225 close to the inner tooth body 224 in the radial direction of the stator yoke 210, and the thickness D4 of the fourth tooth shoe 226 may also be the thickness of the connection end of the fourth tooth shoe 226 close to the inner tooth body 224 in the radial direction of the stator yoke 210.

In other embodiments, the thickness D1 of the first tooth shoe 222 may also be the thickness of the middle section of the first tooth shoe 222 in the radial direction of the stator yoke 210, the thickness D2 of the second tooth shoe 223 may also be the thickness of the middle section of the second tooth shoe 223 in the radial direction of the stator yoke 210, the thickness D3 of the third tooth shoe 225 may also be the thickness of the middle section of the third tooth shoe 225 in the radial direction of the stator yoke 210, and the thickness D4 of the fourth tooth shoe 226 may also be the thickness of the middle section of the fourth tooth shoe 226 in the radial direction of the stator yoke 210.

A plurality of the stator laminations 200 are stacked in the thickness direction of the stator laminations 200, and can form a stator core 12a of the stator 12 of the dual-rotor motor 10 (see fig. 5 and 6 for details).

Since the stator lamination 200 has a plurality of stator teeth 220 arranged at intervals in the circumferential direction of the stator yoke 210, and each stator tooth 220 has an outer tooth 220a and an inner tooth 220b, the stator lamination 200 can be used to manufacture the stator 12 of the dual-rotor motor 10. When the outer rotor 14 and the inner rotor 16 of the double-rotor motor 10 are coaxially disposed and rotate in the same direction at the same speed, the double-rotor motor 10 outputs a torque equal to the sum of the output torques of the outer rotor 14 and the inner rotor 16. Compared with a conventional single-rotor motor (namely, an inner rotor motor or an outer rotor motor), the motor has higher output torque, so that higher output power can be realized.

Since, in the stator lamination 200, the thickness D1 of the first tooth shoe 222 is smaller than the thickness D2 of the second tooth shoe 223, and the thickness D3 of the third tooth shoe 225 is larger than the thickness D4 of the fourth tooth shoe 226 in the circumferential direction of the stator yoke 210, or the thickness D1 of the first tooth shoe 222 is greater than the thickness D2 of the second tooth shoe 223, and the thickness D3 of the third tooth shoe 225 is less than the thickness D4 of the fourth tooth shoe 226, that is, the radial thicknesses of the first tooth shoe 222 and the second tooth shoe 223 on the left and right sides of the outer tooth 220a are different (offset in the radial direction), while the third and

fourth tooth shoes

225 and 226 on the left and right sides of the inner tooth 220b are different in radial thickness (are offset in the radial direction), and the first and

second tooth shoes

222 and 223 on the left and right sides of the outer teeth 220a and the third and

fourth tooth shoes

225 and 226 on the left and right sides of the inner teeth 220b are offset in opposite directions in the circumferential direction. Accordingly, the phase of the cogging torque of the outer motor of the double-rotor motor 10 is shifted to a certain degree, the phase of the cogging torque of the inner motor of the double-rotor motor 10 is also shifted to a certain degree, and the phase shift direction of the cogging torque of the outer motor of the double-rotor motor 10 is opposite to the phase shift direction of the cogging torque of the inner motor of the double-rotor motor 10. Further, after the cogging torques of the inner motor and the outer motor are synthesized (superposed), the maximum value of the synthesized (superposed) cogging torque is smaller than the sum of the maximum values of the cogging torques of the outer motor and the inner motor, so that the total cogging torque of the double-rotor motor 10 can be reduced, the torque ripple can be reduced, and the reduction of the vibration and the noise of the double-rotor motor 10 is facilitated.

Specifically, as shown in fig. 7, in the stator lamination 200, when the thickness D1 of the first tooth shoe 222 is equal to the thickness D2 of the second tooth shoe 223 and the thickness D3 of the third tooth shoe 225 is equal to the thickness D4 of the fourth tooth shoe 226 in the radial direction of the stator yoke 210, the phases of the cogging torques of the outer motor and the inner motor of the double-rotor motor 10 are the same, and after the cogging torques of the inner motor and the outer motor are combined (superimposed), the maximum value of the synthesized (superimposed) cogging torque is the sum of the maximum values of the cogging torques of the outer motor and the inner motor.

As shown in fig. 8, in the stator lamination 200, in the radial direction of the stator yoke 210, when the thickness D1 of the first tooth shoe 222 is smaller than the thickness D2 of the second tooth shoe 223, and the thickness D3 of the third tooth shoe 225 is greater than the thickness D4 of the fourth tooth shoe 226, or when the thickness D1 of the first tooth shoe 222 is greater than the thickness D2 of the second tooth shoe 223, and the thickness D3 of the third tooth shoe 225 is less than the thickness D4 of the fourth tooth shoe 226, the phase of the cogging torque of the outer motor of the double-rotor motor 10 is shifted, the phase of the cogging torque of the inner motor of the double-rotor motor 10 is also shifted, and the phase shift direction of the cogging torque of the outer motor of the double-rotor motor 10 is opposite to the phase shift direction of the cogging torque of the inner motor of the double-rotor motor 10, and after the cogging torques of the inner motor and the outer motor are synthesized (superimposed), the maximum value of the synthesized (superimposed) cogging torque is smaller than the sum of the maximum values of the cogging torques of the outer motor and the inner motor.

In the present embodiment, as shown in fig. 1, in the stator punching sheet 200, each first tooth shoe 222 is located between two adjacent second tooth shoes 223, and each second tooth shoe 223 is located between two adjacent first tooth shoes 222. That is, in the stator lamination 200, the plurality of first tooth shoes 222 and the plurality of second tooth shoes 223 are arranged in a staggered manner. In the stator tooth portion 220, the first tooth shoe 222 is provided corresponding to the third tooth shoe 225 and the second tooth shoe 223 is provided corresponding to the fourth tooth shoe 226 in the radial direction of the stator yoke portion 210. Thus, when the plurality of first tooth shoes 222 and the plurality of second tooth shoes 223 are alternately arranged, the plurality of third tooth shoes 225 and the plurality of fourth tooth shoes 226 are also alternately arranged. Therefore, the structure of the stator punching sheet 200 is more regular, and the stator punching sheet 200 is more favorably manufactured. It is understood that in other embodiments, in the stator punching sheet 200, two adjacent first tooth shoes 222 may also be located between two adjacent second tooth shoes 223.

In the present embodiment, in two adjacent stator teeth 220, a first gap 227 is formed between the first tooth shoe 222 of one stator tooth 220 and the second tooth shoe 223 of the other stator tooth 220, and a second gap 228 is formed between the third tooth shoe 225 of the one stator tooth 220 and the fourth tooth shoe 226 of the other stator tooth 220. In the stator lamination 200, the widths of the first notches 227 in the circumferential direction of the stator lamination 200 are the same, and the widths of the second notches 228 in the circumferential direction of the stator lamination 200 are the same. That is, in the present embodiment, the plurality of stator teeth 220 are arranged at equal intervals. Therefore, the structure of the stator punching sheet 200 is more regular, and the stator punching sheet 200 is more favorably manufactured. It is understood that the plurality of stator teeth 220 may be arranged at unequal intervals in other embodiments.

In the present embodiment, as shown in fig. 3, in the circumferential direction of the stator yoke 210, the length L1 of the first tooth shoe 222 is equal to the length L2 of the second tooth shoe 223 and the lengths L3 and L4 of the third tooth shoe 225 and the fourth tooth shoe 226. Therefore, the structure of the stator punching sheet 200 is more regular, and the stator punching sheet 200 is more favorably manufactured.

In the present embodiment, the length L1 of the first tooth shoe 222, the length L2 of the second tooth shoe 223, the length L3 of the third tooth shoe 225, and the length L4 of the fourth tooth shoe 226 are lengths in the circumferential direction of the stator yoke 210, and the lengths are associated with the circle center angle. Further explanation is provided below in terms of central angles.

In the present embodiment, as shown in fig. 4, the outer tooth bodies 221 and the inner tooth bodies 224 are arranged in the radial direction of the stator yoke portion 210, and constitute the tooth body bodies of the stator tooth portions 220. On the end surface of the stator lamination 200 in the thickness direction, that is, on the top view of the end surface of the stator lamination 200, the tooth body has a center line 220c, and the center line 220c passes through the center point 210a of the stator yoke 210.

The free end of the first tooth shoe 222 corresponds to a first central angle α 1 with the center line 220 c. The free end of the second tooth shoe 223 corresponds to the second central angle α 2 with the center line 220 c. The free end of the third tooth shoe 225 corresponds to a third central angle α 3 with the centre line 220 c. The free end of the fourth tooth shoe 226 corresponds to the fourth central angle α 4 with the center line 220 c. The first central angle α 1 is equal to the second central angle α 2, and the third central angle α 3 is equal to the fourth central angle α 4.

In the present embodiment, the first tooth shoe 222 has a first outer peripheral edge (outer peripheral edge) 2222 and a second outer peripheral edge (inner peripheral edge) 2224, the second outer peripheral edge 2224 being located between the first outer peripheral edge 2222 and the stator yoke 210. A connection line between the end point of the first outer circumferential edge 2222 away from the outer tooth body 221 and the center point 210a is a first connection line X1, and an included angle between the first connection line X1 and the center line 220c is a first central angle α 1.

The second tooth shoe 223 has a third outer peripheral edge 2232 (outer peripheral edge) and a fourth outer peripheral edge 2234 (inner peripheral edge) and the fourth outer peripheral edge 2234 is located between the third outer peripheral edge 2232 and the stator yoke 210. A line connecting the end point of the third peripheral edge 2232 away from the outer tooth body 221 and the center point 210a is a second line X2, and an included angle between the second line X2 and the center line 220c is a second central angle α 2.

The third tooth shoe 225 has a fifth outer circumferential edge 2252 (outer circumferential edge) and a sixth outer circumferential edge 2254 (inner circumferential edge), the fifth outer circumferential edge 2252 being located between the sixth outer circumferential edge 2254 and the stator yoke 210. A line connecting an end point of the fifth outer circumferential edge 2252 away from the inner tooth body 224 and the center point 210a is a third line X3, and an angle between the third line X3 and the center line 220c is a third central angle α 3.

The third tooth shoe 226 has a seventh outer circumferential edge (outer circumferential edge) 2262 and an eighth outer circumferential edge 2264 (inner circumferential edge), the seventh outer circumferential edge 2262 being located between the eighth outer circumferential edge 2264 and the stator yoke 210. The connection line between the end point of the seventh peripheral edge 2262 far from the inner tooth body 224 and the center point 210a is a fourth connection line X4, and the fourth connection line X4 forms a fourth central angle α 4 with the center line 220 c.

In the present embodiment, the first central angle α 1 is smaller than the third central angle α 3, and the second central angle α 2 is smaller than the fourth central angle α 4. Thus, the outer teeth 220a and the inner teeth 220b can be better fitted, thereby enabling higher output power. It is understood that in other embodiments, there may be no constraint between the first central angle α 1 and the third central angle α 3, and in this case, the first central angle α 1 may be greater than, equal to, or less than the third central angle α 3.

In the present embodiment, as shown in fig. 4, the outer circumferential edge (first outer circumferential edge 2222) of the first tooth shoe 222 and the outer circumferential edge (third outer circumferential edge 2232) of the second tooth shoe 223 are symmetrical with respect to the outer tooth body 221 (center line 220c), and the inner circumferential edge (second outer circumferential edge 2224) of the first tooth shoe 222 and the inner circumferential edge (fourth outer circumferential edge 2234) of the second tooth shoe 223 are asymmetrical with respect to the outer tooth body 221 (center line 220 c). In this way, not only can the thickness of the first tooth shoe 222 be made different from the thickness of the second tooth shoe 223, but also the first gap 10a between the outer wall of the outer tooth body 221 and the inner wall surface 14c of the outer rotor 14 can be ensured to be uniform, which is more favorable for achieving higher output.

Specifically, in the present embodiment, the first peripheral edge 2222 and the third peripheral edge 2232 are located on the same circle, and the second peripheral edge 2224 and the fourth peripheral edge 2234 are located on different circles. That is, the first peripheral edge 2222 and the third peripheral edge 2232 are two arcs on a first circle, the second peripheral edge 2224 is an arc on a second circle, the fourth peripheral edge 2234 is an arc on a third circle, the first circle, the second circle, and the third circle are concentrically arranged, and the radii of the first circle, the second circle, and the third circle are different. That is, the outer circumferential edge of the first tooth shoe 222 and the outer circumferential edge of the second tooth shoe 223 are located on the same circle, and the inner circumferential edge of the first tooth shoe 222 and the inner circumferential edge of the second tooth shoe 223 are located on different circles. In this way, not only can the thickness of the first tooth shoe 222 be made different from the thickness of the second tooth shoe 223, but also the first gap 10a between the outer wall of the outer tooth body 221 and the inner wall surface 14c of the outer rotor 14 can be ensured to be uniform, which is more favorable for achieving higher output. It will be appreciated that in other embodiments, the first and third

peripheral edges

2222, 2232 may be on different circles, while the second and fourth

peripheral edges

2224, 2234 may be on the same circle. In this way, a difference in thickness between the first tooth shoe 222 and the second tooth shoe 223 can also be achieved.

It is understood that in other embodiments, the first peripheral edge 2222 and the third peripheral edge 2232 may not lie on the same circle, in which case, the first peripheral edge 2222 and the third peripheral edge 2232 may both be eccentric arcs or both include multiple arcs, while the first peripheral edge 2222 and the third peripheral edge 2232 are symmetrical about the outer pick body 221 (the center line 220 c).

In the present embodiment, as shown in fig. 4, the outer peripheral edge (fifth outer peripheral edge 2252) of the third tooth shoe 225 and the outer peripheral edge of the fourth tooth shoe 226 are asymmetric about the inner gear body 224 (center line 220c) along the seventh outer peripheral edge 2262, and the inner peripheral edge (sixth outer peripheral edge 2254) of the third tooth shoe 225 and the inner peripheral edge (eighth outer peripheral edge 2264) of the fourth tooth shoe 226 are symmetric about the inner gear body 224 (center line 220 c). In this way, not only can the thickness of the third tooth shoe 225 be different from the thickness of the fourth tooth shoe 226, but also the second gap 10b between the inner wall of the inner tooth body 224 and the outer wall surface 16c of the inner rotor 14 can be ensured to be uniform, which is more favorable for achieving higher output.

Specifically, in the present embodiment, the fifth peripheral edge 2252 and the seventh peripheral edge 2262 are located on different circles, and the sixth peripheral edge 2254 and the eighth peripheral edge 2264 are located on the same circle. That is, the sixth outer circumferential edge 2254 and the eighth outer circumferential edge 2264 are two arcs on a fourth circle, the fifth outer circumferential edge 2252 is an arc on a fifth circle, the seventh outer circumferential edge 2262 is an arc on a sixth circle, the fourth circle, the fifth circle, and the sixth circle are concentrically arranged, and the radii of the fourth circle, the fifth circle, and the sixth circle are all different. That is, the outer circumferential edge of the third tooth shoe 225 and the outer circumferential edge of the fourth tooth shoe 226 are located on different circles, and the inner circumferential edge of the third tooth shoe 225 and the inner circumferential edge of the fourth tooth shoe 226 are located on the same circle. In this way, not only can the thickness of the third tooth shoe 225 be different from the thickness of the fourth tooth shoe 226, but also the second gap 10b between the inner wall of the inner tooth body 224 and the outer wall surface 16c of the inner rotor 14 can be ensured to be uniform, which is more favorable for achieving higher output. It will be appreciated that in other embodiments, the sixth 2254 and eighth 2264 peripheral edges may be on different circles, while the fifth 2252 and seventh 2262 peripheral edges may be on the same circle. In this way, it is also possible to achieve a difference in thickness between the third tooth shoe 225 and the fourth tooth shoe 226.

It is understood that in other embodiments, the sixth outer circumferential edge 2254 and the eighth outer circumferential edge 2264 may not lie on the same circle, in which case, the sixth outer circumferential edge 2254 and the eighth outer circumferential edge 2264 may both be eccentric arcs or both include multiple arcs, while the sixth outer circumferential edge 2254 and the eighth outer circumferential edge 2264 are symmetrical about the inner gear body 224 (the centerline 220 c).

As shown in fig. 5, the present embodiment also provides a stator 12. The stator 12 includes a stator core 12 a. The stator core 12a includes a plurality of stator laminations 200, and the plurality of stator laminations 200 are stacked in the thickness direction of the stator laminations 200. The top view of the end face of the stator core 12a is the same as the top view of the end face of the stator punching sheet 200, and the thickness of the stator core 12a is greater than that of the stator punching sheet 200.

The stator core 12a includes an annular yoke portion 122 and a double tooth portion 124. The double teeth 124 are plural, and the plural double teeth 124 are provided at intervals in the circumferential direction of the annular yoke 122. That is, the plurality of double-tooth portions 124 are all disposed on the annular yoke portion 122, and the plurality of double-tooth portions 124 are arranged at intervals and surround the annular yoke portion 122 for a circle. Specifically, in the present embodiment, the stator yokes 210 of the stator lamination 200 are stacked, and form the annular yoke 122 of the stator core 12a, that is, the annular yoke 122 includes a plurality of stacked stator yokes 210. The plurality of stator teeth 220 of the plurality of stator laminations 200 are stacked one on another and form a plurality of double teeth 124 of the stator core 12a, and each double tooth 124 includes a plurality of stacked stator teeth 220.

The double toothing 124 comprises an outer toothing section 1242 and an inner toothing section 1244. The outer tooth sections 1242 are located outside the annular yoke 122 and are connected to the outside of the annular yoke 122. The inner tooth segment 1244 is located inside the annular yoke 122 and is connected to the inside of the annular yoke 122.

The outer tooth section 1242 includes an outer tooth section 12422, a first shoe section 12424, and a second shoe section 12426. The external teeth section 12422 is connected to the outside of the annular yoke 122. The outer tooth segments 12422 extend radially outward of the annular yoke 122 from the annular yoke 122. The first shoe segment 12424 and the second shoe segment 12426 are arranged along the circumferential direction of the annular yoke portion 122 and are each connected to a free end of the outer tooth segment 12422. The free end of the external tooth section 12422 is the end of the external tooth section 12422 away from the annular yoke 122. The first shoe segment 12424 and the second shoe segment 12426 are arranged along the circumferential direction of the annular yoke portion 122 and are connected to the free end of the outer tooth segment 12422, that is, the first shoe segment 12424 and the second shoe segment 12426 respectively extend towards two sides of the outer tooth segment 12422 along the circumferential direction of the annular yoke portion 122, and the extending direction of the first shoe segment 12424 is opposite to the extending direction of the second shoe segment 12426, so that the first shoe segment 12424 and the second shoe segment 12426 are respectively located at two sides of the outer tooth segment 12422. Specifically, in the present embodiment, the external tooth segment 12422 includes several external tooth shafts 221 stacked in layers. The first shoe segment 12424 includes a plurality of first tooth shoes 222 arranged in a stack. The second shoe segment 12426 includes a plurality of second tooth shoes 223 arranged in a stacked arrangement.

The inner spline section 1244 includes an inner spline section 12442, a third shoe section 12444, and a fourth shoe section 12446. The inner tooth sections 12442 are connected to the inside of the annular yoke 122. The inner tooth segments 12442 extend radially inward of the annular yoke 122 toward the annular yoke 122. A third shoe segment 12444 and a fourth shoe segment 12446 are arranged circumferentially of the annular yoke 122 and are each connected to a free end of the inner tooth segment 12442. The free end of the internal tooth section 12442 is the end of the internal tooth section 12442 away from the annular yoke 122. The third shoe segment 12444 and the fourth shoe segment 12446 are arranged along the circumferential direction of the annular yoke portion 122 and are connected to the free ends of the inner tooth segments 12442, that is, the third shoe segment 12444 and the fourth shoe segment 12446 extend toward both sides of the inner tooth segments 12442 in the circumferential direction of the annular yoke portion 122, and the third shoe segment 12444 extends in the opposite direction to the fourth shoe segment 12446, so that the third shoe segment 12444 and the fourth shoe segment 12446 are located on both sides of the inner tooth segments 12442. In the radial direction of the annular yoke 122, the first shoe segment 12424 is provided to correspond to the third shoe segment 12444, and the second shoe segment 12426 is provided to correspond to the fourth shoe segment 12446. Specifically, in the present embodiment, the internal tooth section 12442 includes several internal tooth bodies 224 arranged in a stacked manner. The third shoe segment 12444 includes a plurality of third tooth shoes 225 arranged in a stack. The fourth shoe segment 12446 includes a plurality of fourth tooth shoes 226 arranged in a stack.

In the circumferential direction of the annular yoke portion 122, the thickness D1 of the first shoe segment 12424 is less than the thickness D2 of the second shoe segment 12426, and the thickness D3 of the third shoe segment 12444 is greater than the thickness D4 of the fourth shoe segment 12446, or the thickness D1 of the first shoe segment 12424 is greater than the thickness D2 of the second shoe segment 12426, and the thickness D3 of the third shoe segment 12444 is less than the thickness D4 of the fourth shoe segment 12446. That is, D1 < D2 and D3 > D4, or D1 > D2 and D3 < D4.

In the present embodiment, the stator 12 further includes a coil 12 b. In some embodiments, the outer teeth 12422 have coils 12b wound thereon and the inner teeth 12442 have coils 12b wound thereon, and the annular yoke 122 may not have coils 12b wound thereon. In some embodiments, the annular yoke 122 has the coils 12b wound thereon, and at this time, the outer teeth sections 12422 and/or the inner teeth sections 12442 may not have the coils 12b wound thereon.

As shown in fig. 6, the present embodiment also provides a motor 10. The motor 10 includes a stator 12, an outer rotor 14, and an inner rotor 16. The outer rotor 14 is provided outside a first structure surrounded by the plurality of outer teeth sections 1242, and the outer rotor 14 (having an inner wall surface 14c) is coaxial with the first structure with a first gap 10a interposed therebetween. The inner rotor 16 (having an outer wall surface 16c) is provided in a second structure formed by surrounding the plurality of internal tooth segments 1244, and the inner rotor 16 is coaxial with the second structure with a second gap 10b therebetween. The outer rotor 14 and the inner rotor 16 are coaxially disposed and can rotate in the same direction at the same speed.

The above-described motor 10 is a double-rotor motor, and when the outer rotor 14 and the inner rotor 16, which are coaxially arranged, rotate in the same direction at the same speed, the output torque of the double-rotor motor 10 is equal to the sum of the output torques of the outer rotor 14 and the inner rotor 16. Compared with a conventional single-rotor motor (namely, an inner rotor motor or an outer rotor motor), the motor has higher output torque, so that higher output power can be realized. When the motor 10 includes the stator punching sheet 200, the maximum value of the synthesized (superimposed) cogging torque is smaller than the sum of the maximum values of the cogging torques of the outer motor and the inner motor after the cogging torques of the inner motor and the outer motor of the motor 10 are synthesized (superimposed), so that the total cogging torque of the motor 10 can be reduced, the torque ripple can be reduced, and the vibration and the noise of the motor 10 can be reduced.

In the present embodiment, the outer rotor 14 includes a first yoke 14a and a first permanent magnet 14 b. The first permanent magnets 14b are plural, and the plural first permanent magnets 14b are provided at intervals in the circumferential direction of the first yoke 14 a. The inner rotor 16 includes a second yoke 16a and a second permanent magnet 16 b. The second permanent magnets 16b are plural, and the plural second permanent magnets 16b are provided at intervals in the circumferential direction of the second yoke 16 a. Wherein the number of the first permanent magnets 14b is the same as that of the second permanent magnets 16b, and they are arranged one-to-one. In this way, a higher output power of the motor 10 can be achieved.

In the present embodiment, the plurality of first permanent magnets 14b are disposed on the surface of the first yoke 14a, and at this time, the outer rotor 14 is a surface-mount rotor. The surface-mounted rotor has good performance and simple structure. In other embodiments, the plurality of first permanent magnets 14b may be buried inside the first yoke 14a, and in this case, the outer rotor 14 is a built-in rotor. The built-in rotor can improve the air gap magnetic field intensity, thereby effectively utilizing the reluctance torque component, improving the output performance of the motor and achieving the purpose of improving the output power of the motor. Wherein the shape of the first permanent magnet 14b may be spoke-shaped, U-shaped, or V-shaped.

In the present embodiment, the plurality of second permanent magnets 16b are disposed on the surface of the second yoke 16a, and at this time, the inner rotor 16 is a surface-mount rotor. The surface-mounted rotor has good performance and simple structure. In other embodiments, the plurality of second permanent magnets 16b may be buried in the second yoke 16a, and in this case, the inner rotor 16 is a built-in rotor. The built-in rotor can improve the air gap magnetic field intensity, thereby effectively utilizing the reluctance torque component, improving the output performance of the motor and achieving the purpose of improving the output power of the motor. Wherein the second permanent magnet 16b may have a spoke shape, a U shape, or a V shape.

In some embodiments, the first permanent magnet 14b and the opposing second permanent magnet 16b are of opposite polarity. At this time, the inside and outside magnetic circuits of the motor 10 are a single magnetic circuit, i.e., from the stator core 12a to the inside rotor 16, and back to the stator core 12a to the outside rotor 14. At this time, few magnetic lines of force pass through the stator yoke 220, so the thickness of the stator yoke 220 can be reduced, which is beneficial to reducing the volume of the motor 10 and improving the power density of the motor 10.

Wherein the external tooth section 12422 and the internal tooth section 12442 are respectively wound with the coils 12b when the polarities of the first permanent magnet 14b and the second permanent magnet 16b opposite thereto are opposite. That is, when the first permanent magnet 14b and the second permanent magnet 16b opposite thereto have opposite polarities, the coil 12b of the stator 12 is wound on the double teeth portion 124.

In some embodiments, the first permanent magnet 14b and the opposing second permanent magnet 16b are of the same polarity. At this time, the inner and outer magnetic circuits of the motor 10 are independent of each other, and include two magnetic circuits, one of which is that the inner rotor 16 is connected to the stator core 12a and then returns to the inner rotor 16, and the other of which is that the outer rotor 14 is connected to the stator core 12a and then returns to the outer rotor 14. At this time, the winding (the coil 12b of the stator 12) may be wound around the annular yoke 122 to form an annular winding, which may shorten the winding end of the motor 10, reduce the resistance value, further reduce the copper loss, and improve the efficiency of the motor 10.

The utility model further provides an air-conditioning fan, which comprises the motor 10, the specific structure of the motor 10 refers to the above embodiments, and the air-conditioning fan adopts all the technical schemes of all the above embodiments, so that the air-conditioning fan at least has all the beneficial effects brought by the technical schemes of the above embodiments, and details are not repeated herein. Specifically, in the present embodiment, the motor 10 is a permanent magnet brushless dc motor

In the present embodiment, the motor 10 is applied to an air conditioner fan. It is understood that in other embodiments, the motor 10 may be applied to a washing machine, a refrigerator, and other household appliances.

The above description is only an alternative embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. A stator punching sheet is characterized by comprising:

a stator yoke; and

the stator teeth portion comprises outer teeth and inner teeth;

2. The stator lamination as recited in claim 1, wherein each first tooth shoe is located between two adjacent second tooth shoes;

a first gap is formed between the first tooth shoe of one stator tooth portion and the second tooth shoe of another adjacent stator tooth portion, and a second gap is formed between the third tooth shoe of one stator tooth portion and the fourth tooth shoe of another stator tooth portion;

3. The stator punching sheet according to claim 2, wherein the outer tooth body and the inner tooth body constitute a tooth body of the stator tooth portion, and the tooth body has a center line passing through a center point of the stator yoke portion on an end surface in a thickness direction of the stator punching sheet;

4. The stator punching sheet according to claim 1, wherein the stator punching sheet is arranged on an end face in the thickness direction of the stator punching sheet;

5. A stator is characterized by comprising a stator core, wherein the stator core comprises a plurality of laminated stator laminations as set forth in any one of claims 1-4;

6. An electric machine, comprising:

an outer rotor;

the stator of claim 5, disposed between the outer rotor and the inner rotor.

7. The electric machine of claim 6 wherein the outer rotor comprises a plurality of first permanent magnets arranged at intervals in the circumferential direction;

8. The electric machine of claim 7 wherein the first permanent magnet and the opposing second permanent magnet are of opposite polarity, the outer tooth segment and the inner tooth segment each being wound with a coil.

9. The motor according to claim 7, wherein the first permanent magnet and the second permanent magnet opposed thereto have the same polarity, and the annular yoke is wound with a coil.

10. An air conditioning blower comprising a motor as claimed in any one of claims 6 to 9.